docs: def list_to_str(lst):
      """
      Turn a list into a comma- and/or and-separated string.
  
      Parameters
      ----------
      lst : :obj:`list`
          A list of strings to join into a single string.
  
      Returns
      -------
      str_ : :obj:`str`
          A string with commas and/or ands separating th elements from ``lst``.
  
      """
      if len(lst) == 1:
          str_ = lst[0]
      elif len(lst) == 2:
          str_ = ' and '.join(lst)
      elif len(lst) > 2:
          str_ = ', '.join(lst[:-1])
          str_ += ', and {0}'.format(lst[-1])
      else:
          raise ValueError('List of length 0 provided.')
      return str_